You do have a good voice and the backing vocals are great. The put it in the microwave hook is too hooky and too often for me personally but that's not to say it's a bad thing. Keep writing tunes and people are sure to listen and enjoy :)

I want to start out by saying that you have a beautiful voice. Have you ever considered trying out for some musicals? You'd make it, hands down.

At any rate, on to the review:
I loved the concept of the song. The fact that you could take something as simple a microwave and make a tune out of it is just great, and the song itself turned out fantastic.

The lyrics were wholeheartedly tongue-in-cheek funny, and the rhyming structure was nothing less than fantastic. I never felt like any part was too repetitive, and everything blended perfectly into the refrain.

The piano was a nice touch, and added a great background tune to the song that it wouldn't have been complete without. I also liked how you used yourself for acapella, the effect you were going for really turned out great. Your voice was just fantastic, and it really reminded me of a Broadway performer. You hit all the notes perfectly, and I never felt that a single section felt irregular or slipped up.

Yaddahoo, this is a wonderful song, you're a wonderful artist, and I can tell you're going to go places.